编译环境

• ubuntu 8.04
• gcc 4.2.3
• arm_v5t_le-gcc 3.4.3

所需软件

• [http://www.zlib.net/ Zlib]
• [http://www.ucc.asn.au/~matt/dropbear/dropbear.html Dropbear]

编译过程

编译zlib:

wget http://www.zlib.net/zlib-1.2.3.tar.gz
tar zxvf zlib-1.2.3.tar.gz
mkdir zlib
cd zlib-1.2.3/
CC=arm_v5t_le-gcc ./configure --prefix=/home/border/work/SMG/build-tools/zlib
make
make install

编译dropbear:

wget http://matt.ucc.asn.au/dropbear/releases/dropbear-0.51.tar.gz
tar zxvf dropbear-0.51.tar.gz
mkdir dropbear-build
cd dropbear-build/
mkdir build
../dropbear-0.51/configure --prefix=/home/border/work/SMG/build-tools/dropbear-build/build/ \
    --with-zlib=/home/border/work/SMG/build-tools/zlib/ CC=arm_v5t_le-gcc --host=arm
make
make scp
sudo make install
sudo cp scp build/bin/

其中的scp需要单独编译，然后用把编译好的scp复制到build/bin目录下。

在交叉编译好的程序要使用 file 之类的工具检查一下是否为目标机器的程序:

border@b0rder:~/work/SMG/build-tools/dropbear-build$ file scp
scp: ELF 32-bit LSB executable, ARM, version 1 (SYSV), for GNU/Linux 2.4.17,
dynamically linked (uses shared libs), not stripped

编译好的文件目录结构为:

border@b0rder:~/work/SMG/build-tools/dropbear-build/build$ tree
.
|-- bin
|   |-- dbclient
|   |-- dropbearconvert
|   |-- dropbearkey
|   `-- scp
`-- sbin
    `-- dropbear

生成server key:

cd /etc
mkdir dropbear
cd dropbear
dropbearkey -t rsa -f dropbear_rsa_host_key
dropbearkey -t dss -f dropbear_dss_host_key

启动脚本

把build目录拷贝到ARM机器上, 在启动脚步/etc/init.d/rcS中增加:

dropbear

-- EOF --